/// <summary>
/// Primary entry point.
/// </summary>
public void Run()
{
IsActive = true;
// we want to emit to the bridge minimally once a second since the data feed is
// the heartbeat of the application, so this value will contain a second after
// the last emit time, and if we pass this time, we'll emit even with no data
var nextEmit = DateTime.MinValue;
try
{
while (!_cancellationTokenSource.IsCancellationRequested)
{
// perform sleeps to wake up on the second?
_frontierUtc = _timeProvider.GetUtcNow();
_frontierTimeProvider.SetCurrentTime(_frontierUtc);
var data = new List <DataFeedPacket>();
foreach (var subscription in Subscriptions)
{
var config = subscription.Configuration;
var packet = new DataFeedPacket(subscription.Security, config);
// dequeue data that is time stamped at or before this frontier
while (subscription.MoveNext() && subscription.Current != null)
{
packet.Add(subscription.Current.Data);
}
// if we have data, add it to be added to the bridge
if (packet.Count > 0)
{
data.Add(packet);
}
// we have new universe data to select based on
if (subscription.IsUniverseSelectionSubscription && packet.Count > 0)
{
var universe = subscription.Universe;
// always wait for other thread to sync up
if (!_bridge.WaitHandle.WaitOne(Timeout.Infinite, _cancellationTokenSource.Token))
{
break;
}
// assume that if the first item is a base data collection then the enumerator handled the aggregation,
// otherwise, load all the the data into a new collection instance
var collection = packet.Data[0] as BaseDataCollection ?? new BaseDataCollection(_frontierUtc, config.Symbol, packet.Data);
_changes += _universeSelection.ApplyUniverseSelection(universe, _frontierUtc, collection);
}
}
// check for cancellation
if (_cancellationTokenSource.IsCancellationRequested)
{
return;
}
// emit on data or if we've elapsed a full second since last emit
if (data.Count != 0 || _frontierUtc >= nextEmit)
{
_bridge.Add(TimeSlice.Create(_frontierUtc, _algorithm.TimeZone, _algorithm.Portfolio.CashBook, data, _changes), _cancellationTokenSource.Token);
// force emitting every second
nextEmit = _frontierUtc.RoundDown(Time.OneSecond).Add(Time.OneSecond);
}
// reset our security changes
_changes = SecurityChanges.None;
// take a short nap
Thread.Sleep(1);
}
}
catch (Exception err)
{
Log.Error(err);
_algorithm.RunTimeError = err;
_algorithm.Status = AlgorithmStatus.RuntimeError;
// send last empty packet list before terminating,
// so the algorithm manager has a chance to detect the runtime error
// and exit showing the correct error instead of a timeout
nextEmit = _frontierUtc.RoundDown(Time.OneSecond).Add(Time.OneSecond);
if (!_cancellationTokenSource.IsCancellationRequested)
{
_bridge.Add(
TimeSlice.Create(nextEmit, _algorithm.TimeZone, _algorithm.Portfolio.CashBook, new List <DataFeedPacket>(), SecurityChanges.None),
_cancellationTokenSource.Token);
}
}
Log.Trace("LiveTradingDataFeed.Run(): Exited thread.");
IsActive = false;
}
/// <summary>
/// Syncs the specifies subscriptions at the frontier time
/// </summary>
/// <param name="frontier">The time used for syncing, data in the future won't be included in this time slice</param>
/// <param name="subscriptions">The subscriptions to sync</param>
/// <param name="sliceTimeZone">The time zone of the created slice object</param>
/// <param name="cashBook">The cash book, used for creating the cash book updates</param>
/// <param name="nextFrontier">The next frontier time as determined by the first piece of data in the future ahead of the frontier.
/// This value will equal DateTime.MaxValue when the subscriptions are all finished</param>
/// <returns>A time slice for the specified frontier time</returns>
public TimeSlice Sync(DateTime frontier, IEnumerable <Subscription> subscriptions, DateTimeZone sliceTimeZone, CashBook cashBook, out DateTime nextFrontier)
{
var changes = SecurityChanges.None;
nextFrontier = DateTime.MaxValue;
var earlyBirdTicks = nextFrontier.Ticks;
var data = new List <DataFeedPacket>();
var universeData = new Dictionary <Universe, BaseDataCollection>();
SecurityChanges newChanges;
do
{
universeData.Clear();
newChanges = SecurityChanges.None;
foreach (var subscription in subscriptions)
{
if (subscription.EndOfStream)
{
OnSubscriptionFinished(subscription);
continue;
}
// prime if needed
if (subscription.Current == null)
{
if (!subscription.MoveNext())
{
OnSubscriptionFinished(subscription);
continue;
}
}
var packet = new DataFeedPacket(subscription.Security, subscription.Configuration);
var configuration = subscription.Configuration;
var offsetProvider = subscription.OffsetProvider;
var currentOffsetTicks = offsetProvider.GetOffsetTicks(frontier);
while (subscription.Current.EndTime.Ticks - currentOffsetTicks <= frontier.Ticks)
{
// we want bars rounded using their subscription times, we make a clone
// so we don't interfere with the enumerator's internal logic
var clone = subscription.Current.Clone(subscription.Current.IsFillForward);
clone.Time = clone.Time.ExchangeRoundDownInTimeZone(configuration.Increment, subscription.Security.Exchange.Hours, configuration.DataTimeZone, configuration.ExtendedMarketHours);
packet.Add(clone);
if (!subscription.MoveNext())
{
OnSubscriptionFinished(subscription);
break;
}
}
if (packet.Count > 0)
{
// we have new universe data to select based on, store the subscription data until the end
if (!subscription.IsUniverseSelectionSubscription)
{
data.Add(packet);
}
else
{
// assume that if the first item is a base data collection then the enumerator handled the aggregation,
// otherwise, load all the the data into a new collection instance
var packetBaseDataCollection = packet.Data[0] as BaseDataCollection;
var packetData = packetBaseDataCollection == null
? packet.Data
: packetBaseDataCollection.Data;
BaseDataCollection collection;
if (universeData.TryGetValue(subscription.Universe, out collection))
{
collection.Data.AddRange(packetData);
}
else
{
if (packetBaseDataCollection is OptionChainUniverseDataCollection)
{
var current = subscription.Current as OptionChainUniverseDataCollection;
var underlying = current != null ? current.Underlying : null;
collection = new OptionChainUniverseDataCollection(frontier,
subscription.Configuration.Symbol, packetData, underlying);
}
else if (packetBaseDataCollection is FuturesChainUniverseDataCollection)
{
var current = subscription.Current as FuturesChainUniverseDataCollection;
collection = new FuturesChainUniverseDataCollection(frontier,
subscription.Configuration.Symbol, packetData);
}
else
{
collection = new BaseDataCollection(frontier, subscription.Configuration.Symbol,
packetData);
}
universeData[subscription.Universe] = collection;
}
}
}
if (subscription.Current != null)
{
// take the earliest between the next piece of data or the next tz discontinuity
earlyBirdTicks = Math.Min(earlyBirdTicks, Math.Min(subscription.Current.EndTime.Ticks - currentOffsetTicks, offsetProvider.GetNextDiscontinuity()));
}
}
foreach (var kvp in universeData)
{
var universe = kvp.Key;
var baseDataCollection = kvp.Value;
newChanges += _universeSelection.ApplyUniverseSelection(universe, frontier, baseDataCollection);
}
changes += newChanges;
}while (newChanges != SecurityChanges.None);
nextFrontier = new DateTime(Math.Max(earlyBirdTicks, frontier.Ticks), DateTimeKind.Utc);
return(TimeSlice.Create(frontier, sliceTimeZone, cashBook, data, changes));
}
/// <summary>
/// Primary entry point.
/// </summary>
public void Run()
{
IsActive = true;
// we want to emit to the bridge minimally once a second since the data feed is
// the heartbeat of the application, so this value will contain a second after
// the last emit time, and if we pass this time, we'll emit even with no data
var nextEmit = DateTime.MinValue;
var syncer = new SubscriptionSynchronizer(_universeSelection, _algorithm.TimeZone, _algorithm.Portfolio.CashBook, _frontierTimeProvider);
syncer.SubscriptionFinished += (sender, subscription) =>
{
RemoveSubscription(subscription.Configuration);
Log.Debug($"LiveTradingDataFeed.SubscriptionFinished(): Finished subscription: {subscription.Configuration} at {_algorithm.UtcTime} UTC");
};
try
{
while (!_cancellationTokenSource.IsCancellationRequested)
{
// perform sleeps to wake up on the second?
_frontierUtc = _timeProvider.GetUtcNow();
_frontierTimeProvider.SetCurrentTime(_frontierUtc);
// always wait for other thread to sync up
if (!_bridge.WaitHandle.WaitOne(Timeout.Infinite, _cancellationTokenSource.Token))
{
break;
}
var timeSlice = syncer.Sync(Subscriptions);
// check for cancellation
if (_cancellationTokenSource.IsCancellationRequested)
{
return;
}
// emit on data or if we've elapsed a full second since last emit or there are security changes
if (timeSlice.SecurityChanges != SecurityChanges.None || timeSlice.Data.Count != 0 || _frontierUtc >= nextEmit)
{
_bridge.Add(timeSlice, _cancellationTokenSource.Token);
// force emitting every second
nextEmit = _frontierUtc.RoundDown(Time.OneSecond).Add(Time.OneSecond);
}
// take a short nap
Thread.Sleep(1);
}
}
catch (Exception err)
{
Log.Error(err);
_algorithm.RunTimeError = err;
_algorithm.Status = AlgorithmStatus.RuntimeError;
// send last empty packet list before terminating,
// so the algorithm manager has a chance to detect the runtime error
// and exit showing the correct error instead of a timeout
nextEmit = _frontierUtc.RoundDown(Time.OneSecond).Add(Time.OneSecond);
if (!_cancellationTokenSource.IsCancellationRequested)
{
_bridge.Add(
TimeSlice.Create(nextEmit, _algorithm.TimeZone, _algorithm.Portfolio.CashBook, new List <DataFeedPacket>(), SecurityChanges.None, new Dictionary <Universe, BaseDataCollection>()),
_cancellationTokenSource.Token);
}
}
Log.Trace("LiveTradingDataFeed.Run(): Exited thread.");
IsActive = false;
}
/// <summary>
/// Main routine for datafeed analysis.
/// </summary>
/// <remarks>This is a hot-thread and should be kept extremely lean. Modify with caution.</remarks>
public void Run()
{
var universeSelectionMarkets = new List <string> {
"usa"
};
var frontier = DateTime.MaxValue;
try
{
// don't initialize universe selection if it's not requested
if (_algorithm.Universe != null)
{
// initialize subscriptions used for universe selection
foreach (var market in universeSelectionMarkets)
{
AddSubscriptionForUniverseSelectionMarket(market);
}
}
// compute initial frontier time
frontier = GetInitialFrontierTime();
Log.Trace(string.Format("FileSystemDataFeed.Run(): Begin: {0} UTC", frontier));
// continue to loop over each subscription, enqueuing data in time order
while (!_cancellationTokenSource.IsCancellationRequested)
{
// each time step reset our security changes
_changes = SecurityChanges.None;
var earlyBirdTicks = long.MaxValue;
var data = new List <KeyValuePair <Security, List <BaseData> > >();
// we union subscriptions with itself so if subscriptions changes on the first
// iteration we will pick up those changes in the union call, this is used in
// universe selection. an alternative is to extract this into a method and check
// to see if changes != SecurityChanges.None, and re-run all subscriptions again,
// This was added as quick fix due to an issue found in universe selection regression alg
foreach (var subscription in Subscriptions.Union(Subscriptions))
{
if (subscription.EndOfStream)
{
// skip subscriptions that are finished
continue;
}
var cache = new KeyValuePair <Security, List <BaseData> >(subscription.Security, new List <BaseData>());
data.Add(cache);
var configuration = subscription.Configuration;
var offsetProvider = subscription.OffsetProvider;
var currentOffsetTicks = offsetProvider.GetOffsetTicks(frontier);
while (subscription.Current.EndTime.Ticks - currentOffsetTicks <= frontier.Ticks)
{
// we want bars rounded using their subscription times, we make a clone
// so we don't interfere with the enumerator's internal logic
var clone = subscription.Current.Clone(subscription.Current.IsFillForward);
clone.Time = clone.Time.ExchangeRoundDown(configuration.Increment, subscription.Security.Exchange.Hours, configuration.ExtendedMarketHours);
cache.Value.Add(clone);
if (!subscription.MoveNext())
{
Log.Trace("FileSystemDataFeed.Run(): Finished subscription: " + subscription.Security.Symbol + " at " + frontier + " UTC");
break;
}
}
// we have new universe data to select based on
if (subscription.IsFundamentalSubscription && cache.Value.Count > 0)
{
// always wait for other thread
if (!Bridge.Wait(Timeout.Infinite, _cancellationTokenSource.Token))
{
break;
}
OnFundamental(FundamentalType.Coarse, frontier, configuration, cache.Value);
}
if (subscription.Current != null)
{
// take the earliest between the next piece of data or the next tz discontinuity
earlyBirdTicks = Math.Min(earlyBirdTicks, Math.Min(subscription.Current.EndTime.Ticks - currentOffsetTicks, offsetProvider.GetNextDiscontinuity()));
}
}
if (earlyBirdTicks == long.MaxValue)
{
// there's no more data to pull off, we're done
break;
}
// enqueue our next time slice and set the frontier for the next
Bridge.Add(TimeSlice.Create(frontier, _algorithm.TimeZone, _algorithm.Portfolio.CashBook, data, _changes), _cancellationTokenSource.Token);
// never go backwards in time, so take the max between early birds and the current frontier
frontier = new DateTime(Math.Max(earlyBirdTicks, frontier.Ticks), DateTimeKind.Utc);
}
if (!_cancellationTokenSource.IsCancellationRequested)
{
Bridge.CompleteAdding();
}
}
catch (Exception err)
{
Log.Error("FileSystemDataFeed.Run(): Encountered an error: " + err.Message);
if (!_cancellationTokenSource.IsCancellationRequested)
{
Bridge.CompleteAdding();
_cancellationTokenSource.Cancel();
}
}
finally
{
Log.Trace(string.Format("FileSystemDataFeed.Run(): Data Feed Completed at {0} UTC", frontier));
//Close up all streams:
foreach (var subscription in Subscriptions)
{
subscription.Dispose();
}
Log.Trace("FileSystemDataFeed.Run(): Ending Thread... ");
IsActive = false;
}
}
/// <summary>
/// Primary entry point.
/// </summary>
public void Run()
{
IsActive = true;
// we want to emit to the bridge minimally once a second since the data feed is
// the heartbeat of the application, so this value will contain a second after
// the last emit time, and if we pass this time, we'll emit even with no data
var nextEmit = DateTime.MinValue;
try
{
while (!_cancellationTokenSource.IsCancellationRequested)
{
// perform sleeps to wake up on the second?
var frontier = _timeProvider.GetUtcNow();
_frontierTimeProvider.SetCurrentTime(frontier);
var data = new List <KeyValuePair <Security, List <BaseData> > >();
foreach (var kvp in _subscriptions)
{
var subscription = kvp.Value;
var cache = new KeyValuePair <Security, List <BaseData> >(subscription.Security, new List <BaseData>());
// dequeue data that is time stamped at or before this frontier
while (subscription.MoveNext() && subscription.Current != null)
{
cache.Value.Add(subscription.Current);
}
// if we have data, add it to be added to the bridge
if (cache.Value.Count > 0)
{
data.Add(cache);
}
// we have new universe data to select based on
if (subscription.IsUniverseSelectionSubscription && cache.Value.Count > 0)
{
var universe = subscription.Universe;
// always wait for other thread to sync up
if (!Bridge.Wait(Timeout.Infinite, _cancellationTokenSource.Token))
{
break;
}
// fire the universe selection event
OnUniverseSelection(universe, subscription.Configuration, frontier, cache.Value);
}
}
// check for cancellation
if (_cancellationTokenSource.IsCancellationRequested)
{
return;
}
// emit on data or if we've elapsed a full second since last emit
if (data.Count != 0 || frontier >= nextEmit)
{
Bridge.Add(TimeSlice.Create(frontier, _algorithm.TimeZone, _algorithm.Portfolio.CashBook, data, _changes), _cancellationTokenSource.Token);
// force emitting every second
nextEmit = frontier.RoundDown(Time.OneSecond).Add(Time.OneSecond);
}
// reset our security changes
_changes = SecurityChanges.None;
// take a short nap
Thread.Sleep(1);
}
}
catch (Exception err)
{
Log.Error(err);
_algorithm.RunTimeError = err;
}
IsActive = false;
}
/// <summary>
/// Syncs the specified subscriptions. The frontier time used for synchronization is
/// managed internally and dependent upon previous synchronization operations.
/// </summary>
/// <param name="subscriptions">The subscriptions to sync</param>
public TimeSlice Sync(IEnumerable <Subscription> subscriptions)
{
var delayedSubscriptionFinished = false;
var changes = SecurityChanges.None;
var data = new List <DataFeedPacket>();
// NOTE: Tight coupling in UniverseSelection.ApplyUniverseSelection
var universeData = new Dictionary <Universe, BaseDataCollection>();
var universeDataForTimeSliceCreate = new Dictionary <Universe, BaseDataCollection>();
_frontierTimeProvider.SetCurrentTimeUtc(_timeProvider.GetUtcNow());
var frontierUtc = _frontierTimeProvider.GetUtcNow();
SecurityChanges newChanges;
do
{
newChanges = SecurityChanges.None;
foreach (var subscription in subscriptions)
{
if (subscription.EndOfStream)
{
OnSubscriptionFinished(subscription);
continue;
}
// prime if needed
if (subscription.Current == null)
{
if (!subscription.MoveNext())
{
OnSubscriptionFinished(subscription);
continue;
}
}
var packet = new DataFeedPacket(subscription.Security, subscription.Configuration, subscription.RemovedFromUniverse);
while (subscription.Current != null && subscription.Current.EmitTimeUtc <= frontierUtc)
{
packet.Add(subscription.Current.Data);
if (!subscription.MoveNext())
{
delayedSubscriptionFinished = true;
break;
}
}
if (packet.Count > 0)
{
// we have new universe data to select based on, store the subscription data until the end
if (!subscription.IsUniverseSelectionSubscription)
{
data.Add(packet);
}
else
{
// assume that if the first item is a base data collection then the enumerator handled the aggregation,
// otherwise, load all the the data into a new collection instance
var packetBaseDataCollection = packet.Data[0] as BaseDataCollection;
var packetData = packetBaseDataCollection == null
? packet.Data
: packetBaseDataCollection.Data;
BaseDataCollection collection;
if (universeData.TryGetValue(subscription.Universes.Single(), out collection))
{
collection.Data.AddRange(packetData);
}
else
{
if (packetBaseDataCollection is OptionChainUniverseDataCollection)
{
var current = packetBaseDataCollection as OptionChainUniverseDataCollection;
collection = new OptionChainUniverseDataCollection(frontierUtc, subscription.Configuration.Symbol, packetData, current?.Underlying);
}
else if (packetBaseDataCollection is FuturesChainUniverseDataCollection)
{
collection = new FuturesChainUniverseDataCollection(frontierUtc, subscription.Configuration.Symbol, packetData);
}
else
{
collection = new BaseDataCollection(frontierUtc, subscription.Configuration.Symbol, packetData);
}
universeData[subscription.Universes.Single()] = collection;
}
}
}
if (subscription.IsUniverseSelectionSubscription &&
subscription.Universes.Single().DisposeRequested ||
delayedSubscriptionFinished)
{
delayedSubscriptionFinished = false;
// we need to do this after all usages of subscription.Universes
OnSubscriptionFinished(subscription);
}
}
foreach (var kvp in universeData)
{
var universe = kvp.Key;
var baseDataCollection = kvp.Value;
universeDataForTimeSliceCreate[universe] = baseDataCollection;
newChanges += _universeSelection.ApplyUniverseSelection(universe, frontierUtc, baseDataCollection);
}
universeData.Clear();
changes += newChanges;
}while (newChanges != SecurityChanges.None);
var timeSlice = TimeSlice.Create(frontierUtc, _sliceTimeZone, _cashBook, data, changes, universeDataForTimeSliceCreate);
return(timeSlice);
}
/// <summary>
/// Syncs the specified subscriptions. The frontier time used for synchronization is
/// managed internally and dependent upon previous synchronization operations.
/// </summary>
/// <param name="subscriptions">The subscriptions to sync</param>
public TimeSlice Sync(IEnumerable <Subscription> subscriptions)
{
long earlyBirdTicks;
var changes = SecurityChanges.None;
var data = new List <DataFeedPacket>();
// NOTE: Tight coupling in UniverseSelection.ApplyUniverseSelection
var universeData = new Dictionary <Universe, BaseDataCollection>();
var universeDataForTimeSliceCreate = new Dictionary <Universe, BaseDataCollection>();
SecurityChanges newChanges;
do
{
earlyBirdTicks = MaxDateTimeTicks;
newChanges = SecurityChanges.None;
foreach (var subscription in subscriptions)
{
if (subscription.EndOfStream)
{
OnSubscriptionFinished(subscription);
continue;
}
// prime if needed
if (subscription.Current == null)
{
if (!subscription.MoveNext())
{
OnSubscriptionFinished(subscription);
continue;
}
if (subscription.Current == null)
{
throw new Exception($"SubscriptionSynchronizer.Sync(): subscription.Current is null, configuration: {subscription}");
}
}
var packet = new DataFeedPacket(subscription.Security, subscription.Configuration, subscription.RemovedFromUniverse);
while (subscription.Current.EmitTimeUtc <= _frontier)
{
packet.Add(subscription.Current.Data);
if (!subscription.MoveNext())
{
OnSubscriptionFinished(subscription);
break;
}
}
if (packet.Count > 0)
{
// we have new universe data to select based on, store the subscription data until the end
if (!subscription.IsUniverseSelectionSubscription)
{
data.Add(packet);
}
else
{
// assume that if the first item is a base data collection then the enumerator handled the aggregation,
// otherwise, load all the the data into a new collection instance
var packetBaseDataCollection = packet.Data[0] as BaseDataCollection;
var packetData = packetBaseDataCollection == null
? packet.Data
: packetBaseDataCollection.Data;
BaseDataCollection collection;
if (universeData.TryGetValue(subscription.Universe, out collection))
{
collection.Data.AddRange(packetData);
}
else
{
if (packetBaseDataCollection is OptionChainUniverseDataCollection)
{
var current = packetBaseDataCollection as OptionChainUniverseDataCollection;
collection = new OptionChainUniverseDataCollection(_frontier, subscription.Configuration.Symbol, packetData, current?.Underlying);
}
else if (packetBaseDataCollection is FuturesChainUniverseDataCollection)
{
collection = new FuturesChainUniverseDataCollection(_frontier, subscription.Configuration.Symbol, packetData);
}
else
{
collection = new BaseDataCollection(_frontier, subscription.Configuration.Symbol, packetData);
}
universeData[subscription.Universe] = collection;
}
// remove subscription for universe data if disposal requested AFTER time sync
// this ensures we get any security changes from removing the universe and its children
if (subscription.Universe.DisposeRequested)
{
OnSubscriptionFinished(subscription);
}
}
}
if (subscription.Current != null)
{
if (earlyBirdTicks == MaxDateTimeTicks)
{
earlyBirdTicks = subscription.Current.EmitTimeUtc.Ticks;
}
else
{
// take the earliest between the next piece of data or the current earliest bird
earlyBirdTicks = Math.Min(earlyBirdTicks, subscription.Current.EmitTimeUtc.Ticks);
}
}
}
foreach (var kvp in universeData)
{
var universe = kvp.Key;
var baseDataCollection = kvp.Value;
universeDataForTimeSliceCreate[universe] = baseDataCollection;
newChanges += _universeSelection.ApplyUniverseSelection(universe, _frontier, baseDataCollection);
}
universeData.Clear();
changes += newChanges;
}while (newChanges != SecurityChanges.None);
var timeSlice = TimeSlice.Create(_frontier, _sliceTimeZone, _cashBook, data, changes, universeDataForTimeSliceCreate);
// next frontier time
_frontier = new DateTime(Math.Max(earlyBirdTicks, _frontier.Ticks), DateTimeKind.Utc);
return(timeSlice);
}
/// <summary>
/// Returns an enumerable which provides the data to stream to the algorithm
/// </summary>
public IEnumerable <TimeSlice> StreamData(CancellationToken cancellationToken)
{
PostInitialize();
var shouldSendExtraEmptyPacket = false;
var nextEmit = DateTime.MinValue;
var previousEmitTime = DateTime.MaxValue;
while (!cancellationToken.IsCancellationRequested)
{
TimeSlice timeSlice;
try
{
timeSlice = _subscriptionSynchronizer.Sync(_subscriptionManager.DataFeedSubscriptions);
}
catch (Exception err)
{
Log.Error(err);
// notify the algorithm about the error, so it can be reported to the user
_algorithm.RunTimeError = err;
_algorithm.Status = AlgorithmStatus.RuntimeError;
shouldSendExtraEmptyPacket = _liveMode;
break;
}
// check for cancellation
if (cancellationToken.IsCancellationRequested)
{
break;
}
if (_liveMode)
{
var frontierUtc = FrontierTimeProvider.GetUtcNow();
// emit on data or if we've elapsed a full second since last emit or there are security changes
if (timeSlice.SecurityChanges != SecurityChanges.None ||
timeSlice.Data.Count != 0 ||
frontierUtc >= nextEmit)
{
yield return(timeSlice);
// force emitting every second since the data feed is
// the heartbeat of the application
nextEmit = frontierUtc.RoundDown(Time.OneSecond).Add(Time.OneSecond);
}
// take a short nap
Thread.Sleep(1);
}
else
{
// SubscriptionFrontierTimeProvider will return twice the same time if there are no more subscriptions or if Subscription.Current is null
if (timeSlice.Time != previousEmitTime)
{
previousEmitTime = timeSlice.Time;
yield return(timeSlice);
}
else if (timeSlice.SecurityChanges == SecurityChanges.None)
{
// there's no more data to pull off, we're done (frontier is max value and no security changes)
break;
}
}
}
if (shouldSendExtraEmptyPacket)
{
// send last empty packet list before terminating,
// so the algorithm manager has a chance to detect the runtime error
// and exit showing the correct error instead of a timeout
nextEmit = previousEmitTime.RoundDown(Time.OneSecond).Add(Time.OneSecond);
if (!cancellationToken.IsCancellationRequested)
{
var timeSlice = TimeSlice.Create(
nextEmit,
_dateTimeZone,
_cashBook,
new List <DataFeedPacket>(),
SecurityChanges.None,
new Dictionary <Universe, BaseDataCollection>());
yield return(timeSlice);
}
}
Log.Trace("Synchronizer.GetEnumerator(): Exited thread.");
}